A system device for coring deep water lakes

Abstract

The present invention discloses a system device for coring and drilling in deep-water lakes, comprising an above-water working platform, a propulsion system, an anchoring system, a casing system and a drilling system. Compared with the prior art, the above-water working platform of the device has a reasonable structure, and its structural gap can effectively disperse and reduce the horizontal thrust generated by wind and waves, and the force is balanced, the deadweight is light, and it is safe and reliable; the anchoring capacity of the anchoring system of the device is strong; the casing system of the device can self-righten to offset and balance the force of the casing bending, tilting and falling down due to its deadweight, so that the casing can always maintain a vertical and stable state in the water, especially in deep water; the casing system can also be docked or detached with the above-water working platform in real time to avoid the displacement of the drilling work platform system affecting the stability of the casing.

Description

Technical Field

[0001] The invention relates to the technical field of water drilling, in particular to a system device for coring drilling in deep water lakes. Background Art

[0002] The water coring drilling work in deep-water lakes is different from that on land. Its characteristics are: deep lake water (usually more than 30 meters deep), strong wind and waves (maximum wind force 7-8), thick lake bottom mud (usually more than 4 meters), and common sand layers and gravel layers in the lake bottom. Casing wall protection is usually required. For example, when the water coring drilling work of deep-water lakes was carried out in Nam Co Lake in Tibet, the water drilling construction site was located in the center of the lake, about 8 kilometers away from the nearest lakeshore. The water depth at the construction site was 94.5 meters, the thickness of the lake bottom mud was 4-5 meters, the maximum wind force during the construction period was 7, and the lake bottom drilling encountered sand layers and gravel layers.

[0003] At present, the domestic core drilling technology for land is relatively mature. However, the core drilling technology for water drilling, especially deep-water lake drilling, is still immature. The problems are as follows: there is no safe and applicable deep-water lake drilling water work platform and its supporting anchoring system device and corresponding anchor delivery and anchoring technology and system device; there is no safe and reliable deep-water casing straightening and casing top relative to the work platform anti-displacement system device. Summary of the invention

[0004] The purpose of the present invention is to provide a system device for coring drilling in deep water lakes, so as to solve the technical problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention discloses a system device for coring and drilling in deep-water lakes, comprising an above-water working platform, a propulsion system, an anchoring system, a drilling system and a casing system, wherein the propulsion system, the anchoring system and the drilling system are installed on the above-water working platform, the drilling system comprises a drilling rig and a drill pipe, the casing system is sleeved on the outside of the drill pipe, the casing system comprises a mud circulation pipe, a top live-joint casing, a casing butt joint cone sleeve, a floating body, a deep-water casing combination structure and an anti-movement and water-blocking device, the top live-joint sleeve The bottom end of the pipe is detachably connected to the top end of the deepwater casing combination structure through the casing docking cone sleeve, the casing docking cone sleeve comprises an upper cone sleeve fixed to the bottom end of the top flexible sleeve and a lower cone sleeve fixed to the upper end of the deepwater casing combination structure, the inner cone surface of the upper cone sleeve can fit with the outer cone surface of the lower cone sleeve, the anti-movement and water-blocking device is fixed to the bottom of the deepwater casing combination structure, the mud circulation connecting pipe is connected to the top flexible sleeve, and the float is fixed to the outside of the deepwater casing combination structure.

[0007] Preferably, the deep-water casing combination structure comprises an upper small-diameter casing and a lower large-diameter casing fixedly connected to each other, and the float is an airbag group or a foam plastic casing buoy group; when the float is the airbag group, an upper fixed plate and a lower fixed plate are fixed on the outer wall of the upper small-diameter casing, the airbag group is located between the upper fixed plate and the lower fixed plate, and the airbag group is relatively fixed to the upper fixed plate and the lower fixed plate respectively by fixing ropes; when the float is the foam plastic casing buoy group, the upper fixed plate is fixed on the outer wall of the upper small-diameter casing, and the foam plastic casing buoy group is located below the upper fixed plate.

[0008] Preferably, it also includes an inflation system, which is installed on the water working platform. The inflation system includes an air compressor, an inflation tube and a pressure gauge. One end of the inflation tube is connected to the air outlet of the air compressor, and the pressure gauge is installed on the inflation tube. The other end of the inflation tube is connected to the air inlet of the airbag group.

[0009] Preferably, the anti-movement and water-blocking device includes a casing tray and a kelp gauze water-blocking wrapping layer, the casing tray is fixed on the outer wall of the deep-water casing combination structure, and the kelp gauze water-blocking wrapping layer is wrapped on the outer wall of the deep-water casing combination structure and is located on the lower side of the casing tray.

[0010] Preferably, the casing tray comprises a disc body, an edge plate and reinforcing ribs, the disc body is a circular disc, the edge plate is vertically fixed to the edge of the lower surface of the disc body and is annular, the reinforcing ribs are vertically fixed to the lower surface of the disc body in a radial direction, and a plurality of the reinforcing ribs are evenly distributed along the circumferential direction of the disc body.

[0011] Preferably, the above-water working platform comprises a transverse I-beam and a barrel row, the barrel row comprises a barrel row frame and a circular buoy, the barrel row frame is welded from a longitudinal channel steel, an angle steel and a vertical rib, every two of the barrel row frames and a plurality of longitudinally arranged circular buoys vertically arranged between the two barrel row frames are fixed by binding to form a group of longitudinal barrel rows, a plurality of groups of the barrel rows are arranged in parallel, and the transverse I-beam is fixedly connected to the barrel row frames of the plurality of groups of the barrel rows at the same time to form the above-water working platform.

[0012] Preferably, the anchoring system includes a winch, a connecting chain and a two-claw anchor, the two-claw anchor includes a main anchor rod, two anchor claws and a balance rod, the first end of the main anchor rod is provided with a main anchor ring, one end of the connecting chain is connected to the main anchor ring, the other end of the connecting chain is wound around the drum of the winch, the winch is installed on the water working platform, the two anchor claws are fixed to the second end of the main anchor rod and are symmetrical about the main anchor rod, the anchor claws include a main anchor bent rod, a reinforcing rib plate and a willow-shaped anchor plate, the main anchor bent rod includes a bent section, a first straight rod section and a second straight rod section connected in sequence, the end of the bent section is aligned with the end of the main anchor rod The first straight rod section and the second straight rod section are not collinear, the second straight rod section is biased toward the main anchor straight rod, the willow-shaped anchor plate is fixed to the second straight rod section, the tip of the willow-shaped anchor plate is bent toward the main anchor straight rod, so that the anchor claw is a three-section bending structure as a whole, the reinforcing rib plate is located on the inner side of the bend of the main anchor bent rod, and is fixedly connected to the bent section and the first straight rod section at the same time, the first straight rod section is provided with an anchor lowering and anchor lifting pull ring, the main anchor straight rod is coplanar with the main anchor bent rod, the midpoint of the balance rod is fixed to the second end of the main anchor straight rod, and the balance rod is perpendicular to the plane where the main anchor straight rod and the main anchor bent rod are located.

[0013] Preferably, the connecting chain comprises a main anchor rope and an anchor chain connected to each other, an end of the main anchor rope is wound around the drum of the winch, and an end of the anchor chain is connected to the main anchor ring.

[0014] Preferably, it also includes a mud pump, a mud box, a high-pressure pipe, a mud return pipe, a suction pipe, a drill rod, a drill tool and a drill bit, the drill bit is installed on the drill tool, the drill tool is connected to the drill rod, the drill rod bears the torque provided by the drilling rig and the upward force and downward force along the axial direction of the drill rod, the mud pump and the mud box are installed on the water working platform, the mud outlet of the mud pump is connected to the drill rod through the high-pressure pipe, the mud circulation pipe is connected to the mud box through the mud return pipe, the mud inlet of the mud pump is connected to the suction pipe, and the suction pipe extends into the mud box.

[0015] Preferably, the propulsion system comprises a propeller bracket and a marine propeller, the propeller bracket is installed on the above-water working platform, and the marine propeller is installed on the propeller bracket.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] 1. The design structure of the water work platform is reasonable and the force is balanced. The horizontal thrust generated by wind and waves can be effectively dispersed and reduced through the gap between the barrels. It does not require underwater operation during installation and can sail autonomously. It can meet the conditions of reasonable structure, balanced force, light weight, safety and reliability, and can ensure the safety and normal operation of the platform. The current maximum drilling depth of the platform including the water depth can reach 400 meters. If the displacement of the barrels is increased and the structural strength of the frame is increased, the maximum drilling depth (including the water depth) can reach 1000 meters.

[0018] 2. The design structure of the two-claw anchor is simple, safe and reliable. By increasing the geometric dimensions of the main anchor straight rod, the bent rod and the balance rod, reducing the width of the anchor plate, and bending the main anchor bent rod twice and the anchor plate once, the anchor plate and the bent rod have a reasonable mud entry angle, so that the anchor plate of the two-claw anchor can penetrate the thick silt layer at the bottom of the lake and enter the deep soft mud, thereby greatly improving the anchoring grip of the two-claw anchor, effectively reducing the post-wind displacement of the platform, and meeting the requirements for anchoring and positioning of the water coring drilling work platform system in deep-water lakes;

[0019] 3. The design of the deepwater casing system is novel and reasonable. The real-time docking and disconnection of the top joint casing and the deepwater casing combination structure can be achieved through the casing docking cone sleeve, so that normal drilling can be carried out after mud circulation after docking, and the horizontal displacement of the platform system can be avoided after disconnection to affect the stability of the casing. The docking of the upper cone sleeve and the lower cone sleeve is visually visible, which can ensure the coaxiality of the drill pipe and the casing system, and it is not easy to cause the drill pipe to break due to bending, deformation and rotation. The vertical upward buoyancy of the float is cleverly used to offset and balance the force of the casing system to bend, tilt and fall downward due to its own weight, so that the casing system can be self-righted in the water, especially in deep water, so that the casing system always maintains a vertical and stable state, thereby ensuring the smooth implementation of the coring drilling work in deepwater lakes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 Schematic diagram of the top view of the above-water working platform and the distribution of its superstructure in this embodiment;

[0022] Figure 2 Schematic diagram of the structure of the above-water working platform in this embodiment;

[0023] Figure 3This is a schematic diagram of the anchoring process of the system device for coring drilling in deep water lakes according to this embodiment;

[0024] Figure 4 This is a schematic diagram of the structure of the two-claw anchor in this embodiment;

[0025] Figure 5 for Figure 4 A-direction enlarged view of the middle anchor plate;

[0026] Figure 6 for Figure 4 The view in the B direction;

[0027] Figure 7 for Figure 4 A partial enlarged view of part C in the middle;

[0028] Figure 8 Schematic diagram of the structure of the casing system in this embodiment;

[0029] Fig. 9 This is a schematic diagram of the butt joint method of the casing butt joint cone sleeve in this embodiment;

[0030] Fig.10 is another structural schematic diagram of the casing system in this embodiment;

[0031] Fig.11 It is a structural schematic diagram of the casing system when a foam plastic casing buoy group is used as a floating body;

[0032] Fig.12 This is a schematic diagram of the structure of the anti-movement and water-blocking device in this embodiment;

[0033] Fig.13 is a bottom view of the casing tray in this embodiment;

[0034] Explanation of reference numerals: 1-water working platform; 101-longitudinal channel steel; 102-angle steel; 103-vertical ribs; 104-circular buoy; 105-iron wire; 106-transverse I-beam; 107-wire rope; 2-propulsion system; 201-thruster bracket; 202-marine thruster; 3-anchoring system; 301-windlass; 302-main anchor rope; 303-anchor chain; 304-two-claw anchor; 3041-main anchor straight rod; 3042-main anchor curved rod; a-curved section; b-first straight rod section; c-second straight rod section; 3043-reinforcement rib plate; 3044-willow leaf anchor plate; 3045-balance rod; 3046-main anchor ring; 3047-anchoring and anchoring pull ring; 4-drilling system; 5-casing system; 501-mud circulation pipe; 502-top joint sleeve; 503-casing docking cone sleeve; 5031-upper cone sleeve; 5032-lower cone sleeve; 504-airbag group; 505-deepwater casing combination structure; 5051-upper small-diameter casing; d-upper fixed plate; e-lower fixed plate; 5052-lower large-diameter casing; 506-anti-movement and water-blocking device; 5061-casing tray; 507-foam plastic casing buoy; f-disk body; g-edge vertical plate; h-reinforced vertical ribs; 5062-kelp gauze water-blocking wrapping layer; 6-anchor delivery ship; 601-anchor delivery and anchoring beam; 602-anchor rope; 603-buoy; 7-mud box; 8-mud pump; 9-high-pressure pipe; 10-mud return pipe; 11-water suction pipe; 12-air compressor; 13-inflating pipe; 14-pressure gauge. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The purpose of the present invention is to provide a system device for coring drilling in deep water lakes, so as to solve the technical problems existing in the above-mentioned prior art.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1-13 As shown, this embodiment provides a system device for coring drilling in deep-water lakes, including an above-water working platform 1, a propulsion system 2, an anchoring system 3, a drilling system 4 and a casing system 5.

[0039] Among them, the propulsion system 2, the anchoring system 3 and the drilling system 4 are installed on the water working platform 1, and the drilling system 4 includes a drill pipe, and the casing system 5 is sleeved on the outside of the drill pipe. The casing system 5 is located between the mud layer at the bottom of the lake and the drilling rig. Its main function is to separate the lake water, provide a channel for mud circulation during the drilling process, and at the same time provide a working space for the drill pipe to be lifted and lowered and the drilling and coring work. The drill pipe completes the drilling and coring work through the internal space of the casing system 5, and brings the taken core out of the borehole. The casing system 5 includes a mud circulation pipe 501, a top flexible casing 502, a casing docking cone sleeve 503, a buoy, a deepwater casing combination structure 505 and an anti-movement and water-blocking device 506. The bottom end of the top joint sleeve 502 is detachably connected to the top end of the deepwater casing assembly structure 505 through the sleeve docking cone sleeve 503. The sleeve docking cone sleeve 503 includes an upper cone sleeve 5031 fixed to the bottom end of the top joint sleeve 502 and a lower cone sleeve 5032 fixed to the upper end of the deepwater casing assembly structure 505. The inner cone surface of the upper cone sleeve 5031 can fit with the outer cone surface of the lower cone sleeve 5032. In this embodiment, the lower cone sleeve 5032 is located 1.5-5 meters below the bottom surface of the water working platform 1. By using the sleeve docking cone sleeve 503, the top joint sleeve 502 and the deepwater casing assembly structure 505 can be docked and disengaged in real time, so that the mud circulation can be carried out normally after docking, and the horizontal displacement of the water working platform 1 can be prevented from affecting the stability of the casing after disengagement. When the top flexible sleeve 502, the upper cone sleeve 5031, the lower cone sleeve 5032 and the deepwater casing combination structure 505 are butt-jointed, it can be seen visually that the coaxiality of the drill pipe and the casing system 5 can be ensured, and the drill pipe is not prone to breakage caused by bending, deformation and rotation. The anti-slip and water-blocking device 506 is fixed to the bottom of the deepwater casing combination structure 505 to improve the stability of the casing, and can effectively prevent the mud in the casing from leaking to the bottom of the lake, and the mud leakage caused by the mud erosion of the mud layer around the bottom of the casing, causing the casing to tilt or even fall, thereby ensuring the normal coring drilling work in deepwater lakes. The mud circulation pipe 501 is connected to the top flexible sleeve 502 to facilitate the discharge of mud. The float is fixed on the outside of the deepwater casing assembly structure 505. In this embodiment, the airbag group 504 is located 5 to 30 meters from the water surface. The number of airbag groups 504 is determined according to the weight of the casing system 5 and the required buoyancy, which can be 1-3 groups. The number of airbags in each group can be 1-3, the diameter of each airbag can be 0.3-0.6 meters, the length of each airbag can be 3-4.5 meters, and the airbag pressure resistance is > 0.3MPa. After inflation, the buoyancy of the airbag group 504 is greater than the gravity, which will apply a vertical upward thrust to the casing system 5. The casing maintains a vertical state under the action of its own gravity, its own buoyancy, the thrust applied by the airbag group 504 and the friction of the mud layer, thereby achieving the effect of straightening the casing.By cleverly utilizing the vertical upward buoyancy of the float to offset and balance the force of the casing system 5 bending, tilting and falling down due to its own weight, the casing system 5 can always maintain a vertical and stable state in the water, especially in deep water, thereby ensuring the smooth implementation of the underwater coring drilling work in deep lakes.

[0040] When the system device for coring drilling in deepwater lakes of this embodiment is used, the water working platform 1 is first sailed to the drilling position through the propulsion system 2, the water working platform 1 is anchored through the anchoring system 3, the deepwater casing assembly structure 505 is lowered, and the top joint casing 502 is docked with the deepwater casing assembly structure 505 through the casing docking cone sleeve 503, the drill rod is lowered along the inside of the casing system 5 to the mud layer at the bottom of the lake, and the mud circulation pipe 501 is connected to the mud suction system on the water working platform 1, and the drilling system 4 is started after the adjustment is completed. By setting the casing system 5, a mud circulation channel from the bottom of the hole to the platform system is provided for the coring drilling work in deepwater lakes, and a limit protection is provided for the drill rod during rotation during the working process.

[0041] Further, in this embodiment, the floating body is an airbag group 504, and those skilled in the art may also select other types of floating bodies such as foam plastic sleeve buoys, as long as they can provide buoyancy. In this embodiment, the deepwater casing combination structure 505 includes an upper small-diameter casing 5051 and a lower large-diameter casing 5052 that are fixedly connected, and the airbag group 504 is fixed to the outer side of the upper small-diameter casing 5051. Specifically, an upper fixed plate d and a lower fixed plate e are fixed on the outer wall of the upper small-diameter casing 5051, and the airbag group 504 is located between the upper fixed plate d and the lower fixed plate e. The airbag group 504 is relatively fixed to the upper fixed plate d and the lower fixed plate e respectively through a fixing rope. When the floating body is a foam plastic sleeve buoy group, only the upper fixed plate is provided on the outer wall of the upper small-diameter casing, and the foam plastic sleeve buoy group is located below the upper fixed plate.

[0042] In order to facilitate inflation, the present embodiment further includes an inflation system, which is installed on the water working platform 1. The inflation system includes an air compressor 12, an inflation tube 13 and a pressure gauge 14. One end of the inflation tube 13 is connected to the air outlet of the air compressor 12, and the pressure gauge 14 is installed on the inflation tube 13. After the airbag group 504 is lowered into the water to a predetermined position, the air compressor 12 inflates the airbag group 504 through the inflation tube 13, and the pressure of the airbag group 504 is observed by the pressure gauge. The inflation pressure should be less than the pressure resistance value of the airbag. When the pressure of the airbag group 504 is insufficient, the airbag group 504 should be supplemented with air at any time. It should be noted that when a foam plastic sleeve buoy group is used as a float, there is no need to use an inflation system.

[0043] The type of the anti-movement and water-blocking device 506 can be selected by a person skilled in the art as needed. In this embodiment, the anti-movement and water-blocking device 506 includes a casing tray 5061 and a kelp gauze water-blocking wrapping layer 5062. The casing tray 5061 is fixed to the outer wall of the lower part of the deep-water casing assembly structure 505, and the kelp gauze water-blocking wrapping layer 5062 is wrapped on the outer wall of the deep-water casing assembly structure 505 and is located at the lower side of the casing tray 5061. Generally, the wrapping length of the kelp gauze water-blocking wrapping layer 5062 is 2-4 meters, and the casing tray 5061 is located 3-18 meters from the bottom end of the deep-water casing assembly structure 505.

[0044] On the one hand, the casing tray 5061 limits the kelp gauze water-blocking wrapping layer 5062 on the lower side, and on the other hand, increases the contact area with the lake bottom mud layer, making the deepwater casing assembly structure 505 more stable. In this embodiment, the casing tray 5061 includes a tray body f, an edge vertical plate g and a reinforcing rib h. The tray body f is a circular tray. The edge vertical plate g is vertically fixed to the edge position of the lower surface of the tray body f and is annular. The reinforcing rib h is vertically fixed to the lower surface of the tray body f in a radial direction. A plurality of reinforcing ribs h are evenly distributed along the circumferential direction of the tray body f.

[0045] In order to improve the wind and wave resistance, in this embodiment, the water working platform 1 includes a transverse I-beam 106 and a barrel row. The barrel row includes a barrel row frame and a round buoy 104, and the barrel row frame is welded by a longitudinal channel steel 101, an angle steel 102 and a vertical rib 103. Every two barrel row frames and a plurality of longitudinally arranged round buoys 104 vertically arranged between the two barrel row frames are tied by wire 105 or rope to form a group of longitudinal barrel rows. Multiple groups of barrel rows are arranged in parallel, and the transverse I-beam 106 is fixedly connected to the barrel row frames of the multiple groups of barrel rows at the same time to form the water working platform 1. The diagonal direction of the water working platform 1 is tightened by a steel wire rope 107, and the two ends of the steel wire rope 107 are respectively connected to locks, and the locks are fixed on the barrel row frame, thereby further improving the wind and wave resistance. By designing the barrel-frame type water working platform 1, the structural gap can be increased, the horizontal thrust generated by wind and waves can be effectively dispersed and eliminated, and no underwater operation is required during installation. The conditions of reasonable structure, balanced force, light weight, safety and reliability can be met.

[0046] In order to improve the anchoring ability of the anchoring system 3, the anchoring system 3 of this embodiment includes a winch 301, a connecting chain and a two-claw anchor 304. The two-claw anchor 304 includes a main anchor rod 3041, two anchor claws and a balance rod 3045. The first end of the main anchor rod 3041 is provided with a main anchor ring 3046, one end of the connecting chain is connected to the main anchor ring 3046, and the other end of the connecting chain is wound on the drum of the winch 301. The winch 301 is fixed on the water working platform 1, and its number and distribution method can be selected according to actual needs. In this embodiment, there are four winches 301, which are respectively fixed on the four corners of the water working platform 1. The two anchor claws are fixed to the second end of the main anchor rod 3041 and are symmetrical about the main anchor rod 3041. The anchor claws include a main anchor bent rod 3042, a reinforcing rib plate and a willow-shaped anchor plate. The main anchor curved rod 3042 includes a curved section, a first straight rod section and a second straight rod section which are connected in sequence. The end of the curved section is connected to the second end of the main anchor straight rod 3041. The first straight rod section and the second straight rod section are not colinear, and the second straight rod section is biased toward the main anchor straight rod 3041. The willow-shaped anchor plate is fixed to the second straight rod section, and the tip of the willow-shaped anchor plate is bent toward the main anchor straight rod 3041, so that the anchor claw is a three-section curved structure as a whole. The reinforcing rib plate is located on the inner side of the curve of the main anchor curved rod 3042, and is fixedly connected to the curved section and the first straight rod section at the same time. The first straight rod section is provided with an anchor lowering and anchoring pull ring 3047. The main anchor straight rod 3041 is coplanar with the main anchor curved rod 3042, and the midpoint of the balance rod 3045 is fixed to the second end of the main anchor straight rod 3041, and the balance rod 3045 is perpendicular to the plane where the main anchor straight rod 3041 and the main anchor curved rod 3042 are located.

[0047] The dimensions of the two-claw anchor 304 of this embodiment are as follows: the total length of the balance rod 3045 is 3-6 meters, the distance between the bend of the anchor plate and the tip of the anchor plate is two-thirds of the total length of the anchor plate before bending, the angle between the two parts of the anchor plate is 10°±3°, and it is welded to the main anchor bent rod 3042. The main anchor bent rod 3042 is formed by two heating and bending, the purpose of which is to improve the mud entry angle of the main anchor bent rod 3042, so as to obtain greater grip. The angle between the first straight rod section and the main anchor straight rod 3041 is 55°±3°, and the angle between the first straight rod section and the second straight rod section is 10°±2°, so that the mud entry angle of the tip of the anchor plate is controlled at 30°~45°.

[0048] This embodiment adopts the method of increasing the geometric dimensions of the main anchor straight rod 3041, the main anchor bent rod 3042 and the balance rod 3045, reducing the width of the anchor plate, and bending the main anchor bent rod 3042 twice and the anchor plate once, so that the anchor plate and the main anchor bent rod 3042 have a reasonable mud entry angle, so that the anchor plate can penetrate the thick silt layer at the bottom of the lake and enter the deep soft mud, thereby greatly improving the anchoring grip of the two-claw anchor 304, overcoming the defects of the existing conventional anchors such as shallow mud penetration depth, inability to penetrate the thick silt layer at the bottom of the lake, insufficient anchoring grip, easy to drag the anchor and large-distance displacement in wind and waves, and meeting the requirements for anchoring and positioning of the water coring drilling work platform system in deep-water lakes.

[0049] In this embodiment, the connecting chain includes a main anchor rope 302 and an anchor chain 303 connected to each other, the end of the main anchor rope 302 is wound around the drum of the winch 301, and the end of the anchor chain 303 is connected to the main anchor ring 3046. According to different actual needs, those skilled in the art may also choose other forms of connecting chains, as long as they can connect the winch 301 and the two-claw anchor 304. When anchoring, the main anchor rope 302 is released while the two-claw anchor 304 is sent to the anchoring position by the anchor delivery ship 6. The anchor delivery ship 6 is provided with an anchor delivery and anchoring beam 601, and the anchoring rope 602 is wound around the round tube at the end of the anchor delivery and anchoring beam 601. After arriving at the anchoring position, the two-claw anchor 304 is placed into the lake bottom by the anchoring rope 602, and then the buoy 603 is fixed to the upper end of the anchoring rope 602, and the anchoring position is marked by the buoy 603.

[0050] In order to facilitate sludge treatment, this embodiment also includes a mud box 7, a mud pump 8, a high-pressure pipe 9, a mud return pipe 10, a water suction pipe 11, a drill pipe, a drill tool and a drill bit. The drill bit is installed on the drill tool, the drill tool is connected to the drill pipe, the drill pipe bears the torque provided by the drilling rig and the upward force and downward force along the axial direction of the drill pipe, and the mud box 7 and the mud pump 8 are installed on the water working platform 1. The mud outlet of the mud pump 8 is connected to the drill pipe through the high-pressure pipe 9, the mud circulation pipe 501 is connected to the mud box 7 through the mud return pipe 10, and the mud inlet of the mud pump 8 is connected to the water suction pipe 11, and the water suction pipe 11 extends into the mud box 7. The mud is pumped along the drill pipe to the drill bit at the bottom of the borehole, and then returns upward through the annular space between the drill pipe and the borehole wall and the annular space between the drill pipe and the casing system 5, enters the mud circulation pipe 501, and then flows back to the mud box 7 through the mud return pipe 10. The mud pump 8 sucks the mud in the mud box 7 through the suction pipe 11, thereby forming a mud circulation.

[0051] In order to realize autonomous navigation of the water working platform 1, the propulsion system 2 of this embodiment includes a propeller bracket 201 and a marine propeller 202. The propeller bracket 201 is installed on the water working platform 1, and the marine propeller 202 is installed on the propeller bracket 201.

[0052] The above-mentioned system device for coring drilling in deep-water lakes was used to carry out drilling on the Nam Co Lake in Tibet. After testing, under natural conditions of a water depth of nearly 94.5 meters, a maximum wind force of 6 to 7, and the presence of sand and gravel layers in the lake bottom sediments, the maximum post-wind displacement of the working platform system was less than 2 meters, the casing was continuously stable for more than 60 days, the drilling depth including the water depth reached 247.94 meters, and the drilling depth of the lake bottom sediment layer was 153.44 meters, achieving the expected effect.

[0053] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A system device for coring deep water lakes, characterized in that: The invention comprises an above-water working platform, a propulsion system, an anchoring system, a drilling system and a casing system, wherein the propulsion system, the anchoring system and the drilling system are installed on the above-water working platform, the drilling system comprises a drilling rig and a drill pipe, the casing system is sleeved on the outside of the drill pipe, the casing system comprises a mud circulation pipe, a top slewing sleeve, a casing butt taper sleeve, a floating body, a deep-water casing combination structure and an anti-movement and water-blocking device, the bottom end of the top slewing sleeve is detachably connected to the top end of the deep-water casing combination structure through the casing butt taper sleeve, the casing butt taper sleeve comprises an upper taper sleeve fixed to the bottom end of the top slewing sleeve and a lower taper sleeve fixed to the upper end of the deep-water casing combination structure, the inner cone surface of the upper taper sleeve can be fitted with the outer cone surface of the lower taper sleeve, the anti-movement and water-blocking device is fixed to the bottom of the deep-water casing combination structure, the mud circulation pipe is communicated with the top slewing sleeve, and the floating body is fixed on the outside of the deep-water casing combination structure; The anchoring system includes a winch, a connecting chain and a two-claw anchor, wherein the two-claw anchor includes a main anchor rod, two anchor claws and a balance rod, a main anchor ring is provided at the first end of the main anchor rod, one end of the connecting chain is connected to the main anchor ring, the other end of the connecting chain is wound around the drum of the winch, the winch is installed on the water working platform, the two anchor claws are fixed to the second end of the main anchor rod and are symmetrical about the main anchor rod, the anchor claws include a main anchor bent rod, a reinforcing rib plate and a willow-shaped anchor plate, the main anchor bent rod includes a bent section, a first straight rod section and a second straight rod section connected in sequence, the end of the bent section is connected to the second end of the main anchor rod The ends are connected, the first straight rod section and the second straight rod section are not colinear, the second straight rod section is biased toward the main anchor straight rod, the willow-shaped anchor plate is fixed to the second straight rod section, the tip of the willow-shaped anchor plate is bent toward the main anchor straight rod, so that the anchor claw is a three-section curved structure as a whole, the reinforcing rib plate is located on the inner side of the bend of the main anchor bent rod, and is fixedly connected to the bent section and the first straight rod section at the same time, the first straight rod section is provided with an anchor lowering and anchor lifting pull ring, the main anchor straight rod is coplanar with the main anchor bent rod, the midpoint of the balance rod is fixed to the second end of the main anchor straight rod, and the balance rod is perpendicular to the plane where the main anchor straight rod and the main anchor bent rod are located.

2. The system device for coring deep water lakes according to claim 1, characterized in that: The deepwater casing combination structure includes an upper small-diameter casing and a lower large-diameter casing that are fixedly connected, and the float is an air bag group or a foam plastic casing buoy group; when the float is the air bag group, an upper fixed plate and a lower fixed plate are fixed on the outer wall of the upper small-diameter casing, the air bag group is located between the upper fixed plate and the lower fixed plate, and the air bag group is relatively fixed to the upper fixed plate and the lower fixed plate respectively through a fixing rope; when the float is the foam plastic casing buoy group, the upper fixed plate is fixed on the outer wall of the upper small-diameter casing, and the foam plastic casing buoy group is located below the upper fixed plate.

3. The system device for coring deep water lakes according to claim 2, characterized in that: It also includes an inflation system, which is installed on the water working platform. The inflation system includes an air compressor, an inflation pipe and a pressure gauge. One end of the inflation pipe is connected to the air outlet of the air compressor, and the pressure gauge is installed on the inflation pipe. The other end of the inflation pipe is connected to the air inlet of the airbag group.

4. The system device for coring deep water lakes according to claim 1, characterized in that: The anti-movement and water-blocking device includes a casing tray and a kelp gauze water-blocking wrapping layer. The casing tray is fixed on the bottom outer wall of the deep-water casing combination structure, and the kelp gauze water-blocking wrapping layer is wrapped on the outer wall of the deep-water casing combination structure and is located on the lower side of the casing tray.

5. The system device for coring deep water lakes according to claim 4, characterized in that: The casing tray includes a tray body, an edge plate and reinforcing ribs. The tray body is a circular tray. The edge plate is vertically fixed to the edge of the lower surface of the tray body and is annular. The reinforcing ribs are vertically fixed to the lower surface of the tray body in a radial direction. A plurality of reinforcing ribs are evenly distributed along the circumferential direction of the tray body.

6. The system device for coring deep water lakes according to claim 1, characterized in that: The above-water working platform comprises a transverse I-beam and a barrel row, the barrel row comprises a barrel row frame and a circular buoy, the barrel row frame is welded by longitudinal channel steel, angle steel and vertical ribs, every two of the barrel row frames and a plurality of longitudinally arranged circular buoys vertically arranged between the two barrel row frames are fixed by binding to form a group of longitudinal barrel rows, a plurality of groups of the barrel rows are arranged in parallel, and the transverse I-beam is fixedly connected to the barrel row frames of the plurality of groups of the barrel rows at the same time to form the above-water working platform.

7. The system device for coring deep water lakes according to claim 1, characterized in that: The connecting chain comprises a main anchor rope and an anchor chain which are connected to each other. The end of the main anchor rope is wound around the drum of the winch, and the end of the anchor chain is connected to the main anchor ring.

8. The system device for coring deep water lakes according to claim 1, characterized in that: It also includes a mud pump, a mud box, a high-pressure pipe, a mud return pipe, a water suction pipe, a drill rod, a drill tool and a drill bit. The drill bit is installed on the drill tool, and the drill tool is connected to the drill rod. The drill rod bears the torque provided by the drilling rig and the upward force and downward force along the axial direction of the drill rod. The mud pump and the mud box are installed on the water working platform. The mud outlet of the mud pump is connected to the drill rod through the high-pressure pipe, the mud circulation pipe is connected to the mud box through the mud return pipe, the mud inlet of the mud pump is connected to the water suction pipe, and the water suction pipe extends into the mud box.

9. The system device for coring deep water lakes according to claim 1, characterized in that: The propulsion system comprises a propeller bracket and a marine propeller. The propeller bracket is installed on the above-water working platform, and the marine propeller is installed on the propeller bracket.

Images